from flask import (current_app, flash, redirect, render_template, request,
                   url_for)
from flask_login import current_user, login_user, login_required, logout_user
from . import auth
from .forms import (LoginForm, ResetPasswordForm, ResetPasswordRequestForm,
                    RegistrationForm)
from .. import db
from ..email import create_message, send_async
from ..models import User
import os
import shutil


@auth.before_app_request
def before_request():
    """
    Checks if a user is unconfirmed when visiting specific sites. Redirects to
    unconfirmed view if user is unconfirmed.
    """
    if (current_user.is_authenticated and not current_user.confirmed
            and request.blueprint != 'auth'
            and request.endpoint != 'static'):
        return redirect(url_for('auth.unconfirmed'))


@auth.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    login_form = LoginForm(prefix='login-form')
    if login_form.validate_on_submit():
        user = User.query.filter_by(username=login_form.user.data).first()
        if user is None:
            user = User.query.filter_by(email=login_form.user.data).first()
        if user is not None and user.verify_password(login_form.password.data):
            login_user(user, login_form.remember_me.data)
            next = request.args.get('next')
            if next is None or not next.startswith('/'):
                next = url_for('main.dashboard')
            return redirect(next)
        flash('Invalid email/username or password.')
    return render_template('auth/login.html.j2', login_form=login_form,
                           title='Log in')


@auth.route('/logout')
@login_required
def logout():
    logout_user()
    flash('You have been logged out.')
    return redirect(url_for('main.index'))


@auth.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    registration_form = RegistrationForm(prefix='registration-form')
    if registration_form.validate_on_submit():
        user = User(email=registration_form.email.data.lower(),
                    password=registration_form.password.data,
                    username=registration_form.username.data)
        db.session.add(user)
        db.session.commit()
        user_dir = os.path.join(current_app.config['NOPAQUE_STORAGE'],
                                str(user.id))
        if os.path.exists(user_dir):
            shutil.rmtree(user_dir)
        os.mkdir(user_dir)
        token = user.generate_confirmation_token()
        msg = create_message(user.email, 'Confirm Your Account',
                             'auth/email/confirm', token=token, user=user)
        send_async(msg)
        flash('A confirmation email has been sent to you by email.')
        return redirect(url_for('auth.login'))
    return render_template('auth/register.html.j2',
                           registration_form=registration_form,
                           title='Register')


@auth.route('/confirm/<token>')
@login_required
def confirm(token):
    if current_user.confirmed:
        return redirect(url_for('main.dashboard'))
    if current_user.confirm(token):
        db.session.commit()
        flash('You have confirmed your account. Thanks!')
        return redirect(url_for('main.dashboard'))
    else:
        flash('The confirmation link is invalid or has expired.')
        return redirect(url_for('auth.unconfirmed'))


@auth.route('/unconfirmed')
def unconfirmed():
    if current_user.is_anonymous:
        return redirect(url_for('main.index'))
    elif current_user.confirmed:
        return redirect(url_for('main.dashboard'))
    return render_template('auth/unconfirmed.html.j2', title='Unconfirmed')


@auth.route('/confirm')
@login_required
def resend_confirmation():
    token = current_user.generate_confirmation_token()
    msg = create_message(current_user.email, 'Confirm Your Account',
                         'auth/email/confirm', token=token, user=current_user)
    send_async(msg)
    flash('A new confirmation email has been sent to you by email.')
    return redirect(url_for('auth.unconfirmed'))


@auth.route('/reset', methods=['GET', 'POST'])
def reset_password_request():
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    reset_password_request_form = ResetPasswordRequestForm(
        prefix='reset-password-request-form')
    if reset_password_request_form.validate_on_submit():
        submitted_email = reset_password_request_form.email.data
        user = User.query.filter_by(email=submitted_email.lower()).first()
        if user:
            token = user.generate_reset_token()
            msg = create_message(user.email, 'Reset Your Password',
                                 'auth/email/reset_password', token=token,
                                 user=user)
            send_async(msg)
        flash('An email with instructions to reset your password has been '
              'sent to you.')
        return redirect(url_for('auth.login'))
    return render_template(
        'auth/reset_password_request.html.j2',
        reset_password_request_form=reset_password_request_form,
        title='Password Reset')


@auth.route('/reset/<token>', methods=['GET', 'POST'])
def reset_password(token):
    if current_user.is_authenticated:
        return redirect(url_for('main.dashboard'))
    reset_password_form = ResetPasswordForm(prefix='reset-password-form')
    if reset_password_form.validate_on_submit():
        if User.reset_password(token, reset_password_form.password.data):
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('auth.login'))
        else:
            return redirect(url_for('main.index'))
    return render_template('auth/reset_password.html.j2',
                           reset_password_form=reset_password_form,
                           title='Password Reset')